French tissue stereocard techniques were developed by J.L. Tardieu in 1853. Tissue stereocards consist of a print on translucent paper mounted on a card cut to frame the print and often with a tissue added . The image could be tinted and the tint visible when lit from behind as a transparency. The tissue format of stereocards were available commercially by 1855. The largest amount of tissue stereocards were produced between 1858 and 1875. Many tissue stereocard producers are still unidentified. Many are marked only by initials such as these which are marked B.K. Photos and J.M.